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<title>教务管理系统 - 发生错误</title>
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            <h1 class="cover-heading">发生错误</h1>
            <p class="lead">可能存在以下原因</p>
            <p class="lead">1.&nbsp;账户/密码错误</p>
            <p class="lead">2.&nbsp;Session过期&nbsp;&nbsp;</p>
            <p class="lead">3.&nbsp;操作失败&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p>
            <h4><a href="javascript:history.go(-1)">返回上一页</a></h4>
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